Investigations are continuing into what caused part of a dam to give way in central Queensland that claimed the life of a four-year-old girl.

Engineers expect to know in the next few days what caused part of the Bedford weir to give way, near Blackwater.

Four-year-old Nelani Koefer and three adults were swept away when a 1.2 metre high tube on top of the weir suddenly deflated, releasing 6,000 megalitres of water.

The adults were saved after grabbing onto tree branches but the girl disappeared.

Her body was found this morning 800 metres down stream from the weir on the Mackenzie River.

The girl's mother is being treated in hospital for shock.

Acting Police Inspector David Stein say the child's death is a terrible blow for the Blackwater community.

"On top of what happened last Thursday night with the storm here and the enormous clean-up operation that has taken place, this is just just a terrible ending for what has been a horrible week for the residents of Blackwater," he said.

"This death will really take its toll on this community."

The operator of the dam, Sunwater, has inspected six similar structures across the state this morning and all have been cleared.

Sunwater chief executive Peter Boettcher says experts will complete a full inspection on the failed structure by this afternoon.

"The weir was operating very well, there were no signs of anything leading up to the failure," he said.

"It was last inspected in July this year and there were no issues identified then.

"Last week we were on site as well and again no issues were identified so there were no signs leading up to the failure that there was a problem."

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